基于压缩蒙特卡罗粒子滤波算法的结构模型参数识别方法研究

PARAMETER IDENTIFICATION METHOD OF STRUCTURAL MODEL BASED ON COMPRESSED MONTE CARLO PARTICLE FILTER ALGORITHM

  • 摘要: 介绍了压缩蒙特卡罗(CMC)原理,对一维和多维CMC算法进行研究。为了提高粒子滤波(PF)算法的计算效率,将CMC算法和PF算法结合,得到了计算效率更高的压缩蒙特卡罗的粒子滤波(CMC-PF)算法。然后,开展CMC-PF算法在结构刚度参数识别、改进Bouc-Wen (MBW)滞回模型参数识别和装配式双柱地铁高架车站恢复力模型参数识别中的应用,研究结果为在结构刚度参数识别中,当粒子数取值5000,压缩率取值0.2时,CMC-PF算法的精度与PF算法的精度基本一致,计算耗时降低24.13%;在MBW模型参数识别中,CMC-PF(粒子数1000,压缩率0.2)算法的精度与PF算法(粒子数500)的精度基本一致,计算耗时降低55.52%;基于CMC-PF 算法参数识别结果建立的装配式双柱地铁高架车站恢复力模型具有良好的精度,可以较好的反映装配式双柱地铁高架车站的滞回性能。上述研究表明,在结构模型参数识别中,通过选择合理的粒子数和压缩率,CMC-PF算法可以达到PF算法的精度,并具有更高的计算效率。

     

    Abstract: This article introduces the Compressed Monte Carlo (CMC) algorithm, and studies one-dimensional and multi-dimensional CMC algorithms. In order to improve the computational efficiency of the particle filter (PF) algorithm, the CMC algorithm and PF algorithm were combined to obtain the Compressed Monte Carlo particle filter (CMC-PF) algorithm with higher computational efficiency. Then, carried out was the application of the CMC-PF algorithm in the structural stiffness parameter identification, of the modified Bouc-Wen (MBW) hysteretic model parameter identification and, of the restoring force model parameter identification of the prefabricated double-column subway elevated station. The research results show that: in the structural stiffness parameter identification, when the particle number is set to 5000 and the rate of compression is set to 0.2, the accuracy of the CMC-PF algorithm is basically the same as that of the PF algorithm, and the calculation time is reduced by 24.13%; in the parameter identification of the MBW model, the accuracy of the CMC-PF algorithm (the particle number is set to 1000, the rate of compression is set to 0.2) is basically the same as that of the PF algorithm (particle number is set to 500), and the calculation time is reduced by 55.52%; and based on the CMC-PF algorithm parameter identification results, restoring force models of the prefabricated double-column subway elevated station are established, which have good accuracy and can reflect the hysteretic performance of the prefabricated double-column subway elevated station. The above research indicates that: in the structural model parameter identification, the CMC-PF algorithm can achieve the accuracy of the PF algorithm and has higher computational efficiency, by selecting both the reasonable particle number and the rate of compression.

     

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